Greetings, CSimon.
I'm glad to see you in the Community. I want to provide information on how you can settle/match payments from your bank account.
QuickBooks Online shares suggestions for matches to existing transactions depending on how they were categorized and if they have the same amount. We help match data within 90 days of the transaction date.
For more details about how the system handles incoming transactions, you can visit this article:
How to add and match downloaded banking transactions
I'm looking forward to your response concerning the online payments. The Community team will be on a lookout for you.